George b



(No Model.)

G. B. WEBB.

TENSION ADJUSTER. No. 398,099. Patented Feb. 19, 1889.

NITE STATES arnnr flatten.

GEORGE ll. \VEBB, OF NEWARK, NEIV JERSEY, ASSIGNOR TO IVYCKOFF, SEAMANS & BENEDICT, OF NEW YORK, N. Y.

TENSION- SPECIFICATION forming part of Letters PatentN'o. 398,099, dated February 19, 1889.

4 Application filed April 6, 1887. Serial No. 233,883- (No model.) v

.To all whom it may concern.-

Be it known that I, GEORGE B. \VEBB, a citizen of the United States, residing at Newark, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in 'lension-Adjusters; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters of reference marked thereon, which form a part of this specification.

The object of this invention is to enable chine to be adjusted to suit the strength or touch of the operator with greater facility and nicety of exactness; and it consists in the arrangements and combination of parts, substantially as will be hereinafter set forth, and finally embodied in the clauses of the claim.

Referring to the accompanying drawings, in which like letters indicate corresponding parts in each of the several figures, Figure l is a rear elevation of a portion of a type-writing machine, showing the relation of the improvements to the body of the machine. Fig. 2 is a detail perspective view showing the improved construction more clearly, and Fig. 3 a'vertical sectional view at right angles to the adj Listing-screw.

Heretofore the finger-key tension of that class of type-writing machines commonly known in the market as Remington Standard Type-Vriters has been provided with a tension-spring arranged on the pivotal bar of a lever or rocker connected with the keys and carrying the ordinary escapement-dog, said spring being secured at one end to the frame of the machine and at the opposite end to said bar by means of an adjustable collar which receives the end of the said spring and an ordinary set-screw which holds said collar in position. As a result of this construction, when the operator desired to adjust the tension and the said set-screw was loosened, the collar (unless held by the hand) revolved around the bar or shaft until the i tension of the spring spent its force. Then to adjust the spring required a rewinding and careful and repeated independent adjustment of the set-screw, which rendered the process of setting the machine tedious and unsatisfactory. In the improved device it is only necessary to turn the adjustingscrews in one direction or the other to increase or diminish the tension of the spring, there being no danger of losing the initial position from which it is desired to increase or diminish the tension.

In said drawings, (1. im'licates anordinary type-writin g frame, p rovidin gbearings for the type-bars and keys for operating the same, and also having at the rear of said frame hangers or bearings b, on which a tension-lever or rocker is fnlcru med, said tension-lever being preferably of the ordinary construction found in the type-writing machine above referred to, but to which I do not wish in any way to limit myself.

In the drawings the lever or rocker referred to is marked 0, and is fulcrumed in the ears or lugs b b of the said hanger Z). Said lever or rocker is provided with an upwardly-extending finger, b sometimes called a dog, which operates in connection with the teeth of a sliding rack. The lever has also a forward extension which connects with bars 0', at the opposite ends of which is suspended a bar, (I, which latter extends beneath the keys and on which said keys rest. \Vhen the said keys are depressed, the bar d, wires 0 c and bar 0 are likewise depressed, and the lever or rocker 0 caused to turn slightly in its fulcrum-a1 bearings, the tension-spring 6 serving to cushion the blow on the key in the ordinary manner and to return the keys and the said dog to their normal position. The spring 6 at one end is secured to the hanger b and at the opposite end to a collar, f, so that when the said collar is turned around the shaft or bar 0" of the lever the poweror tension of the springs will be increased or diminished.

To enable the collar to be adjusted positively to the desired extent, I have provided an adj Listing-screw, g, which engages the shaft 0 tangentially, as illustrated in Fig. 2, the periphery of the shaft 0 being provided with an encircling threaded groove, 0", with which the adj listing-screw engages.

The adjusting screw revolves freely in hearings in the collar, so that the only eifect of turning the screw will be to cause the collar to turn on the shaft and affect the spring as described. When the collar is brought to its desired position. no further setting is required.

The adjusting-screw g diflers materially from the set-screw common to the ordinary tension devices in that the said adjustingscrew not only serves to hold the collarf and shaft or bar c of the lever or rocker c in fixed relation after the spring has been brought to the proper tension, but serves also to turn said collar or to increase or diminish the tension of the spring-a work that heretofore has been done by the hand alone. In referring, therefore, to the adj Listing-screw I refer to something diiferei'it from a set-screw.

It will be observed upon reference to the detail drawing in Fig. that the adjustingscrew which works in the collar f en gages the shaft orbar with i n the peripheral and threaded groove It thus serves as a key, preventingthe collar from moving longitudinally along the shaft or bar, making additional mechanism for that purpose unnecessary.

The device may be applied to other de vices than type-writing machines.

Having ih us described. the invention, what I claim as new is 1.- In a type-writing machine, the combination,-With a shaft and a collar mounted thereupon, of a spring coiled loosely around the shaft and secured at one end to a fixed part of the machine and at the other end to the collar, and a screw for varying the position of the collar and adjusting the tension of the spring.

2. In a type-writing machine, the combination, with a rock-shaft provided with feeddogs, of a returning-spring therefor, a mov' able support carrying one end of said spring mounted upon the rock-shaft, and an adjusting-screw serving to move the support, all substantially as shown.

In a typeavriting machine, the combination, with the rock-shaft having a peripheral threaded groove; of a collar encircling the shaft, a screw journaled in the collar and engaging the shaft, and a spring secured at one end to the collar and at its other end to a fixed part of the machine.

4. In a type-writing machine, the combination, with a shaft and a collar mounted thereon, of a spring secured at its ends to the collar and a fixed part of the machine, and a screw for varying the position of the collar and adjusting the tension of the spring.

In testimony that I claim the foregoing I have hereunto set my hand this 29th day of March, 1887.

GEORGE E. VEBB.

Witnesses:

CHARLES H. PELL, OSCAR A. MICHEL. 

